Question

Which of the given observation is correct concerning the given scenario?

Test tube: 10 mL of sodium hydroxide mixed with 2 mL of hydrochloric acid
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• A. Addition of red cabbage juice to the test tube will give a reddish coloured solution.
• B. Addition of phenolphthalein to the test tube will give a pink coloured solution.
• C. Addition of red litmus extract to the test tube will give a colourless solution.
• D. Addition of turmeric to the test tube will give a black coloured solution.

Answer 1

The correct option is B Addition of phenolphthalein to the test tube will give a pink coloured solution.

Acids and bases when mixed in equal amount, lead to complete neutralisation and the resulting solution obtained is neutral in nature.
When 10 mL of$KO{H}^{}$ is mixed with 2 ml of HCl, the resulting solution will be basic since the quanity of the base is larger than that of the acid.

• Turmeric changes to red in basic medium and remains yellow in acidic medium.
• Red cabbage extract turns yellow or green in basic medium and turns reddish in acidic medium.
• Phenolphthalein turns pink in basic medium and remains colourless in acidic medium.
• Red litmus extract turns blue in basic medium and remains red in acidic medium.